Well, I can see myself extending my study to five years, but that would be really terrible, because college isn't exactly cheap. Whichever I find that I prefer the most I think I'll decide to further pursue graduate classes in, simply because I guess I'm blessed with the ability and the desire to do so. I was looking at various scholarships available during graduate scholarships, and there's one for the CIA that will pay for everything in exchange for employment, as long as you have a B.S. in Mathematics. With that, 5 years would be no issue because It'd be paid for and I'd be employed for graduate school. The issue is that with such a wide scope, I have a lot of vocations open up to me, and I plan on going Trust-esque with the connections thing. So if I find some better job, there will be serious regret.
As far as depth goes, I think that if I feel sacrifices need to be made to fully appreciate a particular major, then I'll do so, but as long as I job security, the time factor is not an issue (as detailed above). My main worry is that my friend, who attends a university now, wanted to try this exact plan but failed to execute it early due to indecision. So if he wanted to get all the credits, he'll have to be at school for six years, which is terrible. I would really want to avoid that. The degree plan sounds great, and I definitely am going to do that. I expect it would vary widely from college to college?